Why cannot STAs associate with an AP when WPA-PSK authentication is used

The possible causes are as follows:
- The AC's interface connecting to the switch or AP is not added to service VLANs. During the authentication, keys need to be exchanged through the service channel; therefore, the interfaces must be added to service VLANs.
- The STA does not support WPA2-PSK. For example, the computer runs an early version of Windows XP without patches installed, the computer may not support WPA2-PSK. Patches need to be installed on the computer.

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